In a message dated 2/4/00 12:09:43 PM Eastern Standard Time,
ScottH216@aol.com writes:
> All else being equal, aluminum heads will make LESS power than cast iron
> because of this heat loss to the coolant. They are not as efficient. Heat
> that would otherwise be used to build torque by pushing on the piston is
> dissipated into the atmosphere by the cooling system. (Band-aid fixes
> include
> thermally coating the combustion chambers, or increasing compression as
> stated in other posts). The main advantages to aluminum are that it's
easier
>
> to machine and repair than cast iron, the lighter weight can be a benefit
to
>
> handling and in drag racing, and the fact that they usually have a better
> port design than production heads... But just slapping on a set of
aluminum
> heads without making any other changes is no guarantee of increased HP
Also isn't there a better chance of blowing out head gaskets due to the
different expansion rates of the two metals....thus alot more "movement" of
the head gaskets??
-Austin
Vipertruck
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